废话开篇

相比于其他内存数据库，Redis最大的特点就是拥有丰富的数据结构， 经常被称为Date Structure Server。Redis支持的数据结构包含strings, hashes, lists, sets and sorted sets。可以说能包含的基本都包含了，哈哈。

代码示例

下面列出的是对上述数据结构的操作代码示例，请选择参考。

/**  
 * @Title: RedisDemo.java
 * @Package never.database.redis
 * @author "Never" xzllc2010#gmail.com  
 * @date Mar 19, 2014 4:52:07 PM
 * @Description: A demo for Redis's data structure which
 *     include Set, List, SortedSet, hashSet, String and so on.
 */
package never.database.redis;

import java.util.Iterator;
import java.util.Set;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.SortingParams;

public class RedisDemo {

    private Jedis jedis;

    public RedisDemo() {
        this.jedis = new Jedis("127.0.0.1", 6379);
    }

    private void KeyOperate() {
        System.out.println("======================key==========================");
        System.out.println("清空库中所有数据：" + jedis.flushDB());
        System.out.println("判断key999键是否存在：" + jedis.exists("key999"));
        System.out.println("新增key001,value001键值对：" + jedis.set("key001", "value001"));
        System.out.println("判断key001是否存在：" + jedis.exists("key001"));
        System.out.println("新增key002,value002键值对：" + jedis.set("key002", "value002"));
        System.out.println("系统中所有键如下：");
        Set<String> keys = jedis.keys("*");
        Iterator<String> it = keys.iterator();
        while (it.hasNext()) {
            String key = it.next();
            System.out.println(key);
        }
        System.out.println("系统中删除key002: " + jedis.del("key002"));
        System.out.println("判断key002是否存在：" + jedis.exists("key002"));
        System.out.println("设置 key001的过期时间为5秒:" + jedis.expire("key001", 5));
        try {
            Thread.sleep(2000);
        } catch (InterruptedException e) {
        }
        System.out.println("查看key001的剩余生存时间：" + jedis.ttl("key001"));
        System.out.println("移除key001的生存时间：" + jedis.persist("key001"));
        System.out.println("查看key001的剩余生存时间：" + jedis.ttl("key001"));
        System.out.println("查看key所储存的值的类型：" + jedis.type("key001"));
    }

    private void StringOperate() {
        System.out.println("======================String_1==========================");
        // 清空数据
        System.out.println("清空库中所有数据：" + jedis.flushDB());

        System.out.println("=============增=============");
        jedis.set("key001", "value001");
        jedis.set("key002", "value002");
        jedis.set("key003", "value003");
        System.out.println("已新增的3个键值对如下：");
        System.out.println(jedis.get("key001"));
        System.out.println(jedis.get("key002"));
        System.out.println(jedis.get("key003"));

        System.out.println("=============删=============");
        System.out.println("删除key003键值对：" + jedis.del("key003"));
        System.out.println("获取key